crypto/dist/heimdal/kdc/misc.c

   1 /*
   2  * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "kdc_locl.h"
  35
  36 __RCSID("$Heimdal: misc.c 21106 2007-06-18 10:18:11Z lha $"
  37         "$NetBSD$");
  38
  39 struct timeval _kdc_now;
  40
  41 krb5_error_code
  42 _kdc_db_fetch(krb5_context context,
  43               krb5_kdc_configuration *config,
  44               krb5_const_principal principal,
  45               unsigned flags,
  46               HDB **db,
  47               hdb_entry_ex **h)
  48 {
  49     hdb_entry_ex *ent;
  50     krb5_error_code ret;
  51     int i;
  52
  53     ent = calloc (1, sizeof (*ent));
  54     if (ent == NULL) {
  55         krb5_set_error_string(context, "out of memory");
  56         return ENOMEM;
  57     }
  58
  59     for(i = 0; i < config->num_db; i++) {
  60         ret = config->db[i]->hdb_open(context, config->db[i], O_RDONLY, 0);
  61         if (ret) {
  62             kdc_log(context, config, 0, "Failed to open database: %s",
  63                     krb5_get_err_text(context, ret));
  64             continue;
  65         }
  66         ret = config->db[i]->hdb_fetch(context,
  67                                        config->db[i],
  68                                        principal,
  69                                        flags | HDB_F_DECRYPT,
  70                                        ent);
  71         config->db[i]->hdb_close(context, config->db[i]);
  72         if(ret == 0) {
  73             if (db)
  74                 *db = config->db[i];
  75             *h = ent;
  76             return 0;
  77         }
  78     }
  79     free(ent);
  80     krb5_set_error_string(context, "no such entry found in hdb");
  81     return  HDB_ERR_NOENTRY;
  82 }
  83
  84 void
  85 _kdc_free_ent(krb5_context context, hdb_entry_ex *ent)
  86 {
  87     hdb_free_entry (context, ent);
  88     free (ent);
  89 }
  90
  91 /*
  92  * Use the order list of preferred encryption types and sort the
  93  * available keys and return the most preferred key.
  94  */
  95
  96 krb5_error_code
  97 _kdc_get_preferred_key(krb5_context context,
  98                        krb5_kdc_configuration *config,
  99                        hdb_entry_ex *h,
 100                        const char *name,
 101                        krb5_enctype *enctype,
 102                        Key **key)
 103 {
 104     const krb5_enctype *p;
 105     krb5_error_code ret;
 106     int i;
 107
 108     p = krb5_kerberos_enctypes(context);
 109
 110     for (i = 0; p[i] != ETYPE_NULL; i++) {
 111         if (krb5_enctype_valid(context, p[i]) != 0)
 112             continue;
 113         ret = hdb_enctype2key(context, &h->entry, p[i], key);
 114         if (ret == 0) {
 115             *enctype = p[i];
 116             return 0;
 117         }
 118     }
 119
 120     krb5_set_error_string(context, "No valid kerberos key found for %s", name);
 121     return EINVAL;
 122 }
 123